Yellow azo dyestuff for wool.



THE CORPORATION OF CHEMISCHE IABBIK GRIESHEIM ELEKTBON, OF FRANK- EORT-ON-THE-MAIN, GERMANY.

YELLOW AZC nrns'rorr .ron wooL.

No Drawing.

Specification 02mm; Patent.

Application filed Bay 5, 1910. Serial Ho. 5593M.

Patented Get. 4, 1916.

To all whom it may concern:

Be it known that I, AUaUs'r Lnoronn LASKA, doctor of philosophy, chemist, a subject of the German Em eror, and resident of Ofi'enbach-on-the-Mam, in the Grand Duchy of Hesse, Germany, with the postoflice address Gerberstrasse No. 5, have invented new and useful Improvements in Yellow Azo Dyestuffs for Wool, of which the following is a specification.

My invention relates to the production of yellow azo dyestuffs for W001 and consists in combining the tetrazo compounds of diamins corresponding to the formula:

NHg-QXDPNH.

wherein X may be CH or Cl, with one molecular proportion of an ortho-oxy-carboxylic acid of the benzene series and one molecular proportion of 1 -sulfoaryl-3- methyl-5-pyrazolone. The thus obtained dyestuffs dye wool from acid bath yellow shades fast without after-treatment with chromates to white wool and cotton in the milling process. Diamins of the aforesaid constitution are meta-tolidin and dichlorobenzidin. v

The manufacture of the coloring matter is illustrated by the following examples; parts being by weight.

Example I: 10.6 parts of meta-tolidin are tetrazotized and combined with an ice cold soda alkaline solution of 7 .2 parts of salicylic acid. After the formation of the intermediate product a solution of 13 parts of 1- para sulfophenyl 3 methyl 5 pyrazolone,

neutralized with soda, is added and the mixture stirred till the formation of dyestulf 1s complete. The temperature is raised to 70 and the dyestuif precipitated by addition of common salt. It is a yellow-brown powder dissolving in concentrated sulfuric acid with orange, in water with yellow color. The aqueous solution turns slightly red by addition of caustic soda lye; by addition of hydrochloric acid the dyestufl is precipitated from such a solution in shape of red flakes. It dyes wool yellow shades fast to milling.

Example II: 12.65 parts of meta-dichlowith an ice cold soda alkaline solution of 7 .2 parts of salicylic acid. After formation of t e intermediate product a solution of 13 parts 1-para-sulfophenyl-3-meth l-5-pyrazoone, neutralized with soda, is a ded and the mixture stirred until the formation of dyestufi is complete. The temperature is then raised to 70 and the dyestufi' precipitated by addition of common salt. It forms a yellow-brown powder and dissolves in concentrated sulfuric acid with orange, in water with yellow color. The aqueous solution turns red by addition of caustic soda lye; an addition of hydrochloric acid precipitates the dycstufi' from such a solution in form of red flakes. It dyes Wool yellow shades fast against milling.

In analogous manner may be performed the production of dyestufi' if instead of salinrns PATENT onnion. 1

,nneusrr LnoroLn'LesKA, or OFFENBACH-ON-THE-MAIN, GERMANY, ASSIGNOR TO cylic acid are used orthoor meta -cresotinic acid or other sulfoarylmethylpyrazolones,

phenyl-3-methyl:5-pyrazolone or chlorin sub stitution products thereof, for instance 1- meta-sulfophenyl-3-methyl-5-pyrazolone, 1- para-sulfo-orthotolyl-3-methyl-5-pyrazolone, l 7 'ortho chloro para sulfophenyl 3 methyl 5 yrazolone, 1-ortho-chlor0-metasulfopheny -3-methyl-5-pyrazolone, 1 parachloro meta sulfophenyl 3 methyl 5 pyrazolone, 1-4-sulfo-2 5-dichlorophenyl 3- meth l-5-pyrazolone. r

Al thethus obtained dyestuffs substantially show ,the same properties, they dye wool yellow shades fast to white cotton and wool in the milling process.

Now what I claim and desire to secure by Letters Patent is the following:

1. The process for the manufacture of yellow azo dyestuffs for W001 consisting in combining the tetrazo compounds of diamins corresponding to the general formula:

wherein X means CH or G1, with one molecular proportion of an ortho-oxy-carboxylic acid of the benzene series andone molecular proportion of 1 sulfoaryl 3 methyl-5-pyrazolone.

2. As new articles the azo dyestuffs obtained by combinin the tetrazotized diamins of the general ormula:

wherein X means 0H,, or G1, with one molecular proportion of. an ortho-oxy-carboxylic acid of the benzene series and one molecular proportion of 1-sulfoaryl-3- methyl-5-pyrazolone the said dyestuffs being yellow brown powders, dissolving in concentrated sulfuric acid with orange, in water with yellow color, the aqueous solution of which is turned slightly red by addition of caustic soda lye, while by addition of hydrochloric acid the dyestufi is precipitated in shape of yellow flakes; dyeing wool yellow shades fast against milling.

' 3. The process for the manufacture of yellow azo dyestuffs for wool consisting in combining the tetrazo compound of metameta dichlorobenzidin with one molecule of an orthopxy-carboxylic acid of the benzene methyl-5-pyrazolone. Y

4. As new articles the azo dyestuffs obtained by COmbiIllIg the tetrazo compound ic o of meta-meta-' robenzidin with one molecule of an ortho-oxy-carboxylicacid of the benzene series and one molecule of 1- sulfoargl 3 methyl 5 pyrazolone, the said dyestu s being ye low brown powders, dissolving in concentrated sulfuric acid with orange, in water with yellow color, the aqueous solution of which is turned slightly red by addition of caustic soda lye, while the dyestuif is precipitated in shape of yellow flakes by addition of hydrochloric acid to such a solution; dyeing wool yellow shades fast to milling.

In testimony, that I claim the foregoing as my invention, I have signed my name in presence of two witnesses, this 22nd day of April 1910.

AUGUST LEOPOLD LASKA. 

